Multivariate-parameter optimization of the alkaline peroxide mechanical pulp (APMP) process for larch (Larix gmelinii Rupr.) using Box-Behnken design

Abstract

The study is aiming at the finding of optimal pulping conditions for the alkaline peroxide mechanical pulping process applied to larch in terms of brightness (% ISO) and tensile strength (TS). Based on three variables, the Box-Behnken experimental design was applied to determine the effects of the first-stage and second-stage dosages of H 2 O 2 and the impregnation temperature on % ISO and TS. The equations based on the quadratic regression analysis were developed, which describe the response behaviors as the simultaneous functions of the selected independent variables. The best brightness achieved was 75.4% ISO under the following conditions: first-stage H 2 O 2 3.5%, second-stage H 2 O 2 3.54%, and impregnation temperature 81.4°C. The best TS (37.2 N·m g -1 ) was found under the following conditions: first-stage H 2 O 2 2.4%, second-stage H 2 O 2 3.9%, and impregnation temperature 90°C.

Preparation of sulfomethylated softwood kraft lignin as a dispersant for cement admixture

“…The Box-Behnken design (BBD) was employed as a statistical tool to investigate the impact of process parameters on the properties of OSKL and OSSKL. 26 The current study with several variables using the one-variable-at-a-time approach revealed the importance of the oxidation temperature and time, and the concentration of nitric acid on the OSKL, and the impact of the CH 2 O and Na 2 S 2 O 5 , temperature and time on the properties of OSSKL.…”

Oxidation of Kraft Lignin with Hydrogen Peroxide and its Application as a Dispersant for Kaolin Suspensions

“…The preliminary studies with several variables using one-variable-at-a-time approach revealed the importance of time, temperature, NaOH/H 2 O 2 molar ratio, and H 2 O 2 /lignin molar ratio on the oxidation reaction of KL. This approach was employed to study the impact of nitric acid treatment on the properties of oxidized lignin in the past …”

“…This approach was employed to study the impact of nitric acid treatment on the properties of oxidized lignin in the past. 25 Carboxylate and Phenolate Group Analysis. The charge density of OKL and lignosulfonate was measured using a Muẗek particle charge detector (PCD-04, Germany) according to the procedure described previously.…”

Alternatives for the Management of Industrial Forest Waste: Energy, Bioethanol, and Cellulose Pulp

“…The pretreated material then goes through the mechanical defibration and refining stages [15,16]. This type of pulping is widely used in China as a process for obtaining semi-chemical pulps from wood and nonwood materials [17].…”